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Investigators followed a population of 2,000 women aged over 65 years who did not have osteoporosis, over a 10-year period and measured the number of cases of osteoporosis diagnosed during that time-period. The investigators were interested in the effect of regular exercise on the development of osteoporosis. They divided the women into two groups: 1,000 women who exercised (exposed) and 1,000 women who did not exercise regularly (unexposed).During the 10-year study period, investigators recorded 800 cases of osteoporosis, 300 in those women who exercised regularly and 500 in those who did not. Thu number of person-years at risk was 8,350 in the exposed group and 6,950 in the unexposed groupquestion: a) calculate the risk ratio, odds ratio and incidence rate ratio for the effect of regular excercise on osteoporosis in these women and provide a one-sentence interpretation for each resultb) contrast the findings of these measures of association, and discuss which measure is most appropiate
Suppose that the lives of all such bulbs have a normal distribution with a mean of 750 hours and a standard deviation of 55 hours. Let x (sample mean) be the mean life of range sample of 25 such bulbs.
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
Under the assumption that co payment amounts are normally distributed, find a 99% confidence interval for the mean amount in dollars.
Suppose you manage Tennessee Grilled Pork, a fast food restaurant specializing in pork sandwiches and pork chops on a stick. You have decided to build a new restaurant and have 2 possible site locations
What does the * represent in a boxplot? How many * are there for the variable Book Cost? What are the outlier values? What is the 5-number summary for Book Cost?
Calculate the test statistic for the claim in, using the following information. Sample information: A random sample of 40 repairs has a sample mean price of $132.09 and a sample standard deviation of $13.58.
Discussion should include a critical reflection on the way in which you completed the market challenge element of the module.
We have a box of 12 light bulbs. The probability that a particular light bulbs lights on opening is 0.95. This meets the binomial assumptions. Find the probability that 9 light bulbs light up.
Determine the probability that exactly 8 of them started smoking before 18 years of age.
A medical school claims that more than 28% of its students plan to go into general practice. It is found that among a random smaple of 130 of the school's students, 32% of them plan to go into general practice. Find the P-value for a test of the s..
In testing equality of two means below, determine the test statistic? (Use the equal variances formula)
How many waiters and busboys should report for work at the start of each time period to minimize the total staff required for one day's operation.
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